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myarbrough@oreilly.com 10 years ago
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@ -250,29 +250,29 @@ Proof of stake is a system by which existing owners of a currency can "stake" cu
===== Monero
((("Monero (XMR) alt-coin")))Monero is another implementation of CryptoNote. It has a slightly flatter issuance curve than Bytecoin, issuing 80% of the currency in the first four years. It offers the same anonymity features inherited from CryptoNote.
((("Monero (XMR) alt coin")))Monero is another implementation of CryptoNote. It has a slightly flatter issuance curve than Bytecoin, issuing 80% of the currency in the first four years. It offers the same anonymity features inherited from CryptoNote.
* Block generation: 1 minute
* Total currency: 18.4 million XMR
* Consensus algorithm: Cryptonight Proof-Of-Work
* Market capitalization: $5 million USD in mid-2014
* Consensus algorithm: Cryptonight proof of work
* Market capitalization: $5 million in mid-2014
===== Darkcoin
((("Darkcoin")))Darkcoin was launched in January of 2014. Darkcoin implements anonymous currency using a re-mixing protocol for all transactions called DarkSend. Darkcoin is also notable for using 11 rounds of different hash functions((("Proof-Of-Work algorithm","for Darkcoin"))) (blake, bmw, groestl, jh, keccak, skein, luffa, cubehash, shavite, simd, echo) for the Proof-Of-Work algorithm.
((("Darkcoin")))Darkcoin was launched in January 2014. Darkcoin implements anonymous currency using a re-mixing protocol for all transactions called DarkSend. Darkcoin is also notable for using 11 rounds of different hash functions((("proof-of-work algorithm","for Darkcoin"))) (blake, bmw, groestl, jh, keccak, skein, luffa, cubehash, shavite, simd, echo) for the proof-of-work algorithm.
* Block generation: 2.5 minutes
* Total currency: maximum 22 million DRK
* Consensus algorithm: Multi-algorithm Multi-round Proof-Of-Work
* Market capitalization: $19 million USD in mid-2014(((range="endofrange", startref="ix_ch09-asciidoc4")))(((range="endofrange", startref="ix_ch09-asciidoc3")))(((range="endofrange", startref="ix_ch09-asciidoc2")))(((range="endofrange", startref="ix_ch09-asciidoc1")))
* Total currency: Maximum 22 million DRK
* Consensus algorithm: Multi-algorithm multi-round proof of work
* Market capitalization: $19 million in mid-2014(((range="endofrange", startref="ix_ch09-asciidoc4")))(((range="endofrange", startref="ix_ch09-asciidoc3")))(((range="endofrange", startref="ix_ch09-asciidoc2")))(((range="endofrange", startref="ix_ch09-asciidoc1")))
=== Noncurrency alt-chains
=== Noncurrency Alt Chains
((("chains, alternative","noncurrency", id="ix_ch09-asciidoc5", range="startofrange")))((("non-currency alt-chains", id="ix_ch09-asciidoc6", range="startofrange")))Alt-chains are alternative implementations of the blockchain design pattern, which are not primarily used as currency. Many include a currency, but the currency is used as a token for allocating something else, such as a resource or a contract. The currency, in other words, is not the main "point" of the platform, it is a secondary feature.
((("chains, alternative","noncurrency", id="ix_ch09-asciidoc5", range="startofrange")))((("non-currency alt chains", id="ix_ch09-asciidoc6", range="startofrange")))Alt chains are alternative implementations of the block chain design pattern, which are not primarily used as currency. Many include a currency, but the currency is used as a token for allocating something else, such as a resource or a contract. The currency, in other words, is not the main point of the platform; it is a secondary feature.
==== Namecoin
((("Namecoin", id="ix_ch09-asciidoc7", range="startofrange")))Namecoin was the first "fork" of the bitcoin code. Namecoin is a decentralized key-value registration and transfer platform using a blockchain. It supports a global domain-name registry similar to the domain-name registration system on the Internet. Namecoin is currently used as an alternative((("Domain Name Service (DNS)"))) Domain Name Service (DNS) for the root-level domain +.bit+. Namecoin can also be used to register names and key-value pairs in other namespaces, for storing things like email addresses, encryption keys, SSL certificates, file signatures, voting systems, stock certificates, and a myriad of other applications.
((("Namecoin", id="ix_ch09-asciidoc7", range="startofrange")))Namecoin was the first fork of the bitcoin code. Namecoin is a decentralized key-value registration and transfer platform using a block chain. It supports a global domain-name registry similar to the domain-name registration system on the Internet. Namecoin is currently used as an alternative((("domain name service (DNS)"))) domain name service (DNS) for the root-level domain +.bit+. Namecoin can also be used to register names and key-value pairs in other namespaces, for storing things like email addresses, encryption keys, SSL certificates, file signatures, voting systems, stock certificates, and a myriad of other applications.
The namecoin system includes the namecoin currency (symbol NMC), which is used to pay transaction fees for registration and transfer of names. At current prices, the fee to register a name is 0.01 NMC or approximately 1 US cent. As in bitcoin, the fees are collected by namecoin miners.

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